Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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000
AUUS46 KPDT 301124
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
425 AM PDT SUN APR 30 2017

*** AIR DISPERSION CATEGORIES:   GOOD, FAIR, POOR ***

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE-S 5-10 MPH.      SW-W 20-30 MPH.
TRANSPORT WINDS               SE-S 5-10 MPH.      W 30-40 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON MAY 1         FAIR.

VENTILATION INDEX (CATEGORY)  188 (POOR).         1048 (GOOD).
OUTLOOK FOR MON MAY 1         434 (FAIR).

FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 4-9 MPH.         W 15-25 MPH.
TRANSPORT WINDS               SW 4-9 MPH.         NW 15-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON MAY 1         POOR.

VENTILATION INDEX (CATEGORY)  129 (POOR).         1044 (GOOD).
OUTLOOK FOR MON MAY 1         224 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-9 MPH.         W 10-20 MPH.
TRANSPORT WINDS               SE 4-9 MPH.         W 10-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON MAY 1         GOOD.

VENTILATION INDEX (CATEGORY)  89 (POOR).          966 (GOOD).
OUTLOOK FOR MON MAY 1         367 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      840 (GOOD)
ELLENSBURG   1050 (GOOD)
GOLDENDALE   1050 (GOOD)
TRI-CITIES   1050 (GOOD)
WALLA WALLA  1050 (GOOD)
YAKIMA       1022 (GOOD)
BEND          596 (FAIR)
PRINEVILLE    848 (GOOD)
ENTERPRISE   1050 (GOOD)
HERMISTON    1050 (GOOD)
JOHN DAY      808 (GOOD)
LA GRANDE    1003 (GOOD)
MADRAS        858 (GOOD)
MEACHAM      1050 (GOOD)
PENDLETON    1050 (GOOD)
REDMOND       828 (GOOD)
SENECA        831 (GOOD)
THE DALLES   1050 (GOOD)

METEOROLOGICAL INFORMATION PROVIDED IN THIS PRODUCT REPRESENTS ONLY
SOME OF THE FACTORS USED IN BURN DECISIONS.  BURN DECISIONS ARE
OUTSIDE THE PURVIEW OF THE NATIONAL WEATHER SERVICE.

THE VENTILATION INDEX IS A TOOL TO ASSIST SMOKE MANAGEMENT
AGENCIES IN DETERMINING BURN OR NO BURN DECISIONS.  A VENTILATION
INDEX GRAPHIC IS ON THE PENDLETON WEBSITE AT THE FOLLOWING ADDRESS:
HTTP://WWW.WRH.NOAA.GOV/PDT/FORECAST/FWXGRAPHICALVENTILATION.PHP?WFO=PDT

IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.

$$



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